Roadgrader gauges



April 19, 1955 v. SCHIAVI ROADGRADER GAUGES Filed March 20, 1952 United States Patent ROADGRADER GAUGES Vincent Schiavi, Wilmington, Del., assignor to Roadgrader Gauge Corporation, Wilmington, Del., a corporation of Delaware Application March 20, 1952, Serial No. 277,570

1 Claim. (Cl. 287-129) The instant invention relates to roadgrader gauges and more particularly to improvements in existing gauges to increase the efiiciency and prolong the life thereof.

One of the primary objects of the invention is the in corporation of means into the elongated bar which supports the scraper blade or moldboard and gauge, and intermediate these two, whereby the gauge may be plumbed in any position of the blade, so that the roller of the gauge will ride properly on the road form.

Still a further aim is the provision of a seal, preferably of rubber, about the screw of the gauge or as it is also known, the jackpin, to keep the latter clear of dust and foreign matter, thus prolonging the life of this part.

The above and other aims and objects will be apparent from the detailed description hereinafter appearing when taken in conjunction with the appended drawing forming a part hereof, to which attention is now directed, and in which like numerals designate like parts and in which:

Fig. l is an elevational view showing the improvements embodied in a roadgrader gauge, the latter shown partially broken away.

Fig. 2 is a plan view of an annular serrated disc constituting the male member of a cooperating pair of such discs.

F Fig. 3 is an elevational view of the male member of Fig. 4 is a plan view, similar to Fig. 2, but of the annular serrated disc constituting the female member of the cooperating discs.

Fig. 5 is a view, partly in section and partly in elevation, of a seal for the jackpin of a gauge, the latter shown broken away; and

Fig. 6 is a sectional view taken on line 6-6 of Fig. 5.

The improvements constituting the present invention are primarily adapted for incorporation into the gauge shown and described in my prior Patent No. 2,467,157, issued April 12, 1949, and attention is directed thereto. Turning to Fig. 1 on the instant drawing, it will be noted that some of the structure of the patent referred to has been reproduced, thus the reference numeral 5 designates the scraper blade or moldboard of a subgrader; numeral 59 the square-thread screw or jackpin; 61 the screwsupported disc; 76 the plate; 78 the semi-circular bead; 48 the elongated bar which supports the blade; 68 the heavy cylindrical roller; 90 the roller frame; 99 the operating cylinder; all the reference numerals for these parts being the same as in said patent.

Departures from the patented disclosure will now be described. Turning again to Fig. 1 it will be noted that the elongated H-bar 48 has an annular female disc 10 rigidly secured thereto to extend in a plane normal to the longitudinal axis thereof. Disc 10 has an internal annular series of teeth 11; a central opening 12 and a pair of oppositely disposed arcuate slots 13 and 13- see Fig. 4. A male disc 14 is similarly rigidly secured, as by welding or the like, to roller frame 90, said male disc also having an annular series of teeth 15, a central hollow hub 16 protruding from the face of the disc having said teeth, and a pair of oppositely disposed arcuate lugs 17 and 17 projecting from its other face--see Figs. 2 and 3. It will be noted that each of said lugs 17 and 17 has three spaced apertures, 18, 18' and 18" and 19,

19- and 19*, respectively, and in the operative position of the discs 10 and 14, the series of teeth 11 and 15 are in meshing or locking engagement by virtue of a pair of headed and threaded bolts 20 and 21 passing through one of the apertures in lugs 17 or 17 and slots 13 or 13*; said locking engagement being attained by nuts 22 and 23 on the threaded end of said bolts. It will further be seen that in the contacting position of the disc members, that is, when their teeth are in mesh, hub 16 passes well through central opening 12. When relative adjustment of the moldboard 5 is necessary with respect to roller 68 of the gauge, the nuts 22 and 23 are loosened sufficiently to disengage the teeth of the discs, the male disc 14 and frame are rotated to a plumb position, whereupon roller 68 will ride properly on the road form.

Turning now to Figs. 5 and 6, it has been found that dirt and sand tend to work down into the central aperture 30 in plate 76, jackpin 59 passing through said aperture. This is now obviated by the provision of a pair of superposed, substantially rectangular, rubber sealing mats 31 and 32. Each of the sealing mats is made of live rubber and has a hole or aperture in the center thereof slightly smaller in diameter than the jackpin 59. The sealing mats are slipped over the threaded part of the jackpin 59 until they reach their proper place at the root of the thread. A rectangular top or frame 34 having apertures 34 34 34 and 34 in the corners thereof, receives threaded bolts 35*, 35 35 and 35 respectively, said bolts passing through the mats and into threaded engagement with plate 76.

The rubber sealing mats are solid and fit tightly about jackpin 59, this being essential to form a satisfactory seal. For this same reason live rubber is used in lieu of conventional rubber, live rubber having the property of freely expanding and contracting. Because the apertures in the sealing mats are smaller in diameter than jackpin 59, each hole 33 in the center of a mat will expand while being slipped over the jackpin and then contract tightly into place.

It will be understood that various changes may be made in the specific disclosure and it is contemplated to cover all such and to be limited in this respect only as may be necessary by the scope of the claim hereto appended.

What I claim and desire to secure by Letters Patent is:

In a roadgrader gauge, a scraper-supporting arm, a roller frame, a disc, having an annular row of teeth on one face thereof secured to said arm, a second disc, also having an annular row of teeth on one face thereof secured to said roller frame, said first disc having a central aperture and a pair of oppositely disposed arcuate apertures adjacent to and internally of its annular row of teeth, said frame disc having a centrally located hub projecting from the face carrying its teeth and a pair of oppositely disposed arcuate lugs having spaced apertures on the face opposed to that having the annular row of teeth, said hub fitting into said central aperture, means for holding said discs together with their teeth in engagement comprising threaded bolts passing thru selected ones of said lug apertures and an arcuate aperture, and a nut for the threaded end of each of said bolts.

References Cited in the file of this patent UNITED STATES PATENTS 526,750 Schnurr Oct. 2, 1894 1,031,801 Madden July 9, 1912 1,177,638 Larson et a1. Apr. 4, 1916 1,307,160 Stokes June 17, 1919 1,706,147 Davidson Mar. 19, 1929 1,872,788 Mulhern Aug. 23, 1932 1,891,285 Loewus Dec. 20, 1932 1,918,121 Mulhern July 11, 1933 2,161,956 Robertson June 13, 1939 2,467,157 Schiavi Apr. 12, 1949 2,510,523 Schiavi June 6, 1950 

